/* ---------- Deck Theatre ---------- */

.deck {
  position: fixed;
  inset: 0;
  background: #08090c;
  color: #fff;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

.deck-stage {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  /* The wheel handler owns paging, so the stage itself must never scroll or
     rubber-band underneath it. */
  overscroll-behavior: none;
  touch-action: pan-y;
}

.deck-slide {
  grid-area: 1 / 1;
  margin: 0;
  width: min(100vw, 100vh * 16 / 9);
  aspect-ratio: 16 / 9;
  opacity: 0;
  visibility: hidden;
  transform: scale(.985);
  transition: opacity .42s cubic-bezier(.22,1,.36,1),
              transform .42s cubic-bezier(.22,1,.36,1),
              visibility 0s linear .42s;
}

.deck-slide.is-current {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition-delay: 0s, 0s, 0s;
}

.deck-slide.is-instant {
  transition: none;
}

.deck-slide img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 6px;
  background: #111318;
  box-shadow: 0 24px 70px rgba(0,0,0,.55);
}

/* ---------- chrome ---------- */

.deck-chrome {
  position: absolute;
  inset: 0;
  pointer-events: none;
  transition: opacity .4s ease;
}

.deck-chrome > * {
  pointer-events: auto;
}

.deck.is-idle .deck-chrome {
  opacity: 0;
}

/* Do not leave invisible buttons catching clicks over the slide. */
.deck.is-idle .deck-chrome > * {
  pointer-events: none;
}

/* At rest the controls sit back far enough to stop competing with the slide,
   and come up to full strength only for the group you reach for. */
.deck-bar,
.deck-rail {
  opacity: .34;
  transition: opacity .25s ease;
}

.deck-bar:hover,
.deck-bar:focus-within,
.deck-rail:hover,
.deck-rail:focus-within {
  opacity: 1;
}

.deck-bar {
  position: absolute;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 2rem;
  gap: 1rem;
}

.deck-bar-top { top: 0; }
.deck-bar-bottom { bottom: 0; }

.deck-label {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: rgba(255,255,255,.55);
  text-decoration: none;
  transition: color .2s ease;
}

a.deck-label:hover { color: #fff; }

.deck-nav {
  display: flex;
  align-items: center;
  gap: .5rem;
}

.deck-btn {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 8px;
  background: rgba(255,255,255,.04);
  color: #fff;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, opacity .2s ease, transform .12s ease;
}

.deck-btn:hover {
  background: rgba(255,255,255,.12);
  border-color: rgba(255,255,255,.32);
}

.deck-btn:active { transform: scale(.92); }

.deck-btn[disabled] {
  opacity: .22;
  pointer-events: none;
}

.deck-counter {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: .78rem;
  letter-spacing: 1px;
  color: rgba(255,255,255,.75);
  min-width: 6ch;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* ---------- progress rail ---------- */

.deck-rail {
  position: absolute;
  top: 50%;
  right: 1.1rem;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 0;
}

.deck-tick {
  width: 14px;
  height: 3px;
  padding: 0;
  border: 0;
  border-radius: 2px;
  background: rgba(255,255,255,.18);
  cursor: pointer;
  transition: background .25s ease, width .25s ease;
}

.deck-tick.is-seen { background: rgba(255,255,255,.38); }

.deck-tick.is-on {
  width: 26px;
  background: #fff;
}

.deck-tick:hover { background: rgba(255,255,255,.7); }

.deck.has-moved .deck-hint {
  opacity: 0;
}

.deck-hint {
  position: absolute;
  pointer-events: none;
  transition: opacity .4s ease;
  left: 50%;
  bottom: 1.6rem;
  transform: translateX(-50%);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: .68rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: rgba(255,255,255,.3);
  white-space: nowrap;
}

/* A 16:9 slide in a portrait phone is tiny, so tell people the deck is worth
   turning sideways for, and get out of the way once they do. */
.deck-rotate {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: none;
  align-items: center;
  gap: .6rem;
  padding: .7rem 1rem;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(8px);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: .68rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: rgba(255,255,255,.75);
  white-space: nowrap;
  animation: deck-rotate-out .6s ease 4s forwards;
}

@keyframes deck-rotate-out {
  to { opacity: 0; visibility: hidden; }
}

@media (max-width: 768px) {
  /* Give the slide the whole width - every pixel counts at this size. */
  .deck-slide {
    width: min(100vw, (100vh - 6rem) * 16 / 9);
  }

  .deck-slide img {
    border-radius: 0;
    box-shadow: none;
  }

  .deck-bar { padding: 1rem 1.1rem; }

  /* The deck title and the two long labels cannot share a 390px row without
     wrapping into each other, so only the way out survives. */
  .deck-bar-top .deck-label + .deck-label,
  .deck-bar-bottom .deck-label {
    display: none;
  }

  .deck-rail { display: none; }

  .deck-hint { display: none; }
}

@media (max-width: 768px) and (orientation: portrait) {
  .deck-rotate { display: flex; }
}

@media (prefers-reduced-motion: reduce) {
  .deck-rotate { animation: none; }
}

@media (prefers-reduced-motion: reduce) {
  .deck-slide,
  .deck-chrome,
  .deck-btn,
  .deck-tick {
    transition: none;
  }
}